Ore-grinder



PATBNTBD JAN. 12, 1904. w. G. PHIPPS. h ORE GRINDBR.

D SEPT. 6, 1902 UNITED STATES Patented January 12, 1904.

PATENT OFFICE.

ORE-GRINDER.

SPECIFICATION forming part o1"` Letters Patent NO. 749,630, dated January12, 1904.

Application led September 6, 1902l Serial No. 122,315. (No model.)

To all whom, t may concern:

Be it known that I, YILLIAM G. PHirrs, a citizen of the United States, residing at Stockton, county of San Joaquin, and State of California, have invented a certain new and useful improvement in Ore-Grinders, of which the following is a specification.

My invention relates to a new and useful improvement in ore-grinders, and has for its object to provide an apparatus for pulverizing ore in which the ore will be ground instead of crushed, as by the usual process.

With this end in view this invention consists in the details of construction and combination of elements hereinafter set forth and then speciiically designated by the claims.

ln order that those skilled in the art to which this invention appertains may understand how to make and use the same, the construction and operation will now be described in detail, referring to the accompanying drawings,form ing a part of this specification, in which Figure l is a. face view of my improved grinder; Fig. Q, a cross-section on the line Q 2 of Fig. l; Fig. 3, a cross-section on the line 3 3 of Fig. l.

The grinder consists of a plate, upon one side of which is formed the cutting edges. The periphery of the plate on the cutting-edge side is a plane or flat surface for a distance in toward the center.

A represents the cutters, which extend radially toward the center and terminate within a short distance of the center. Between the cutters A are arranged auxiliary cutters B, which also extend radially toward the center, but only extend about half-way between the periphery of the plate and the center of the same.

Between the cutters the plate is dished downward toward the center, as shown in Figs. 2 and 3. The plane or flat surface extends inward on the cutters considerably beyond the point where the plate commences to be dished, the balance of the cutters, both A and B, are beveled from the plane surface inward to the point of the cutters, as shown in Figs. 2 and 3.

The material to be ground is fed into the center, and of course it will be understood that the grinder works in conjunction with an opposing surface, which is arranged in close proximity to the grinder, so as to leave a slight space in between the plane or flat surface around the periphery of the grinder and the opposing surface, and this space may be increased or diminished, according to the {ineness desired in the ground ore. The grinder being revolved the cutting edges'A will first come in contact with the ore, making a cleavage instead of a crush, and the ore will gradually be ground iiner and finer until it passes between the plane or iiat surface of the grinder. The grinding will -then be iinished and no material may pass until ground to the required iineness.

The auxiliary cutting edges B tend to keep the coarser material toward the center and equalize the wear.

The back of the plates are annularly beveled, as indicated at C, the bevel being formed at an angle parallel or nearly parallel with the beveled and dished surfaces upon the face of the plate. Thus as the plane o1' flat surface upon the cutters and face of the plate, the beveled surface C not diverging more than twenty degrees from being parallel with the dished surfaces upon the face of the plate, is worn away the plate will be diminished somewhat in diameter on account of the bevel C upon the back of the plate, and all the beveled surfaces will be diminished somewhat; but the plane or fiat surface will remain substantially the same radial width. It will be seen that if the back of the plate is not beveled as the plate wears away upon the face the plane or iiat surfaces would gradually extend toward the center, and if the plate was used long enough the whole upper surface would be flat, the beveled and dished portions being worn away; but by beveling the back of the plate to a sharp edge the plate will be diminished in diameter at the same ratio as the beveled and dished surfaces are diminished on the face of the place.

The grinder may be either made in segments of a circle and oscillated or it may be circular, as shown in the drawings, and revolve.

Of course I do not wish to be limited to the exact construction here shown, as slight modi- IOO lications could be made without departing from the spirit of my invention.

Having thus fully described my invention, what I claim as new and useful isl. In an ore-grinder, a plate in the form of a circle, or a part of a circle, radial cutting edges extending inward toward the center of the plate, said plate being hollowed out or dished between the cutting edges, said cavity commencing at a point a slight distance inward from the periphery and gradually deepening toward the center, each of the cutters being beveled from e point about midway of their length to their inner ends, an annular beveled surface formed upon the back outer edge of the plate, the periphery of the plate being formed with a sharp edge by reason of the annular beveled surface on the back of the plate, substantially as described.

2. In an ore-grinder, a plate in the form of a circle, or a part thereof, main cutters extending inward toward the center of the plate and terminating within a short distance thereof, auxiliary cutters arranged between the main cutters and also extending radially toward the center of the plate, a plane or iiat surface formed on the face of the plate extending inward a distance from the periphery, the balance of the plate in between the cutters being dished toward the center, the plane surface extending inward on the cutters to a point midway of their length, the balance of the cutters being beveled downward to their inner ends, an annular beveled surface formed upon the back of the plate, said annular beveled surface extending from the periphery of the plate inward and downward toward the center and not diverging more than twenty degrees from being parallel with the beveled surfaces upon the face of the plate, the periphery of the plate being formed with a sharp edge by its annular beveled surface, as and for the purpose specified.

In testimony whereof I have hereunto affixed my signature in the presence of two subscribing witnesses.

WILLIAM G. PHIPPS.

Witnesses:

JOHN MARSHALL, GEO. E. CRANE. 

